Document development workflow and internals

internal/normalizers/nws/forecast.go

@@ -42,7 +42,7 @@ func (ForecastNormalizer) Match(e event.Event) bool {
 }
 
 func (ForecastNormalizer) Normalize(ctx context.Context, in event.Event) (*event.Event, error) {
-	_ = ctx // normalization is pure/CPU; keep ctx for future expensive steps
+	_ = ctx // normalization is pure/CPU; keep signature aligned with Normalizer.
 
 	return normalizeForecastEventBySchema(in)
 }